The World Health Organization has raised the risk of the Bundibugyo strain of Ebola turning into a national outbreak in the Democratic Republic of Congo to "very high".

The head of the World Health Organization (WHO) on Wednesday said the Ebola epidemic risk was high at the national and regional levels and low at the global level.

Aid efforts intensified on Wednesday in eastern Congo to curb the growing outbreak of a rare type of Ebola that the World Health Organization said could last for months, as…